1.Electronic stepless adjusting device;2.Built-in labyrinth airflow buffer, work smoothly and silent;3.With ipx4 waterproof design, both for indoor and outdoor use;4.Novel design and nice outline. 1.Electronic stepless adjusting device;2.Built-in labyrinth airflow buffer, work smoothly and silent;3.With ipx4 waterproof design, both for indoor and outdoor use;4.Novel design and nice outline.
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